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引用本文:黄磊,王君波,朱立平,鞠建廷,汪勇,马庆峰.纳木错水温变化及热力学分层特征初步研究.湖泊科学,2015,27(4):711-718. DOI:10.18307/2015.0420
HUANG Lei,WANG Junbo,ZHU Liping,JU Jianting,WANG Yong,MA Qingfeng.Water temperature and characteristics of thermal stratification in Nam Co, Tibet. J. Lake Sci.2015,27(4):711-718. DOI:10.18307/2015.0420
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纳木错水温变化及热力学分层特征初步研究
黄磊1,2, 王君波1, 朱立平1, 鞠建廷1, 汪勇1, 马庆峰1
1.中国科学院青藏高原研究所, 青藏高原环境变化与地表过程重点实验室, 北京 100101;2.中国科学院大学, 北京 100049
摘要:
水温变化是湖泊的重要物理特性,对湖泊的水质特征、湖水能量循环、水生生态系统研究具有重要意义.基于不同季节的实地观测资料,分析青藏高原高海拔、深水大湖纳木错的水温变化特征及季节差异,并着重分析湖水热力学分层的季节变化.结果显示纳木错中部、东部两个湖盆冬季封冻,夏季存在稳定分层,春、秋季混合,是一个典型双季对流、完全混合型湖泊.但两个湖盆水温变化与热力学分层又有各自的特征,东部浅湖盆湖水在春季升温快,夏季分层与秋季翻转均比中部湖盆早,且秋季翻转时水温也比中部湖盆高.初步分析认为两个湖盆不同的湖盆形状及水深分布可能是造成其热力学特征差异的主要原因.
关键词:  水温  热力学分层  季节变化  纳木错  青藏高原
DOI:10.18307/2015.0420
分类号:
基金项目:国家重点基础研究发展计划“973”项目(2012CB956100)、国家自然科学基金项目(41071123)和科技部基础性工作专项(2012FY111400)联合资助.
Water temperature and characteristics of thermal stratification in Nam Co, Tibet
HUANG Lei1,2, WANG Junbo1, ZHU Liping1, JU Jianting1, WANG Yong1, MA Qingfeng1
1.Key Laboratory of Tibetan Environment Changes and Land Surface Processes(TEL), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, P.R.China;2.University of Chinese Academy of Sciences, Beijing 100049, P.R.China
Abstract:
Variation of water temperature is a critical physical property of a lake, which has great significance for other research, such as lake water quality, energy cycle, aquatic ecosystem. Illustrated by Nam Co, characteristics and seasonal differences of lake water temperature distribution were studied in a high altitude deep lake on the Tibetan Plateau, with in-situ monitoring data from different seasons. Then, seasonal variability of thermal stratification was emphatically analyzed. Results imply that in Nam Co, both the middle and eastern parts are frozen up in winter, completely mixed in spring and autumn, and steadily stratified in summer. Thus, Nam Co is a typical dimictic lake, and a holomictic lake at the same time. However, the two parts of Nam Co have unique characteristics in season variability of water temperature and thermal stratification respectively. In spring, temperature rises faster in the relatively shallow basin than that in the middle lake. Meanwhile, the date of summer stratification and autumn overturn is earlier in the shallow basin, in which water temperature is higher when circulated in autumn as well. By preliminary analysis, different topography under water and bathymetric distribution of the two basins probably contribute the most to the difference in the thermodynamic characteristic.
Key words:  Water temperature  thermal stratification  seasonal variability  Nam Co  Tibetan Plateau
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